## anonymous one year ago Which is the set of roots for the equation? x2 + 3x - 8 = 0 a: {18,-1} b: {-6,3} c: {-2,9} d: {9}

1. campbell_st

I think the equation should be $x^2 + 3x - 18 = 0$ is that correct..?

2. anonymous

i think

3. anonymous

yeah it should

4. anonymous

Which is the set of roots for the equation? x2 + 3x - 18 = 0 a: {18,-1} b: {-6,3} c: {-2,9} d: {9}

5. anonymous

what do you guys think

6. jdoe0001

hint: $$\large \begin{array}{cccllll} x^2&+3x&-18\\ &\uparrow &\uparrow \\ &6-3&6\cdot -3 \end{array}$$

7. anonymous

so b

8. jdoe0001

well.. try those 2 roots in "b", see if they work

9. jdoe0001

have you covered factoring of quadratics yet?